"In an online photo gallery of neighborhood picnics and sunrises over Lake Michigan, an image of black dust blotting out the sky galvanized residents of Chicago's Southeast Side to demand action against companies storing enormous mounds of petroleum coke along the Calumet River."

"Spread through social media, the picture taken in late August near 109th Street and Buffalo Avenue helped revive long-standing concerns in the East Side and South Deering neighborhoods about the legacy of pollution from now-shuttered steel mills, blast furnaces and coke ovens that once dominated the area.

Elected officials and regulators eventually took notice of the anger and frustration. In the past month, the owners of three riverfront storage terminals have faced a steady stream of lawsuits, administrative complaints and proposed legal restrictions from the U.S. Environmental Protection Agency, the state EPA, Illinois Attorney General Lisa Madigan, Chicago Mayor Rahm Emanuel, the local alderman and members of Congress."